Wrong star ratings ???

Hi,
Here's the list of star ratings:
1 star = Terrible
2 stars = Poor
3 stars = Average
4 stars = Good
5 stars = Excellent
But, when member gets 0 star, it displays "Terrible member" --> It should display "Not rated member" --> Something wrong ?
One more thing, I tried to find the phrase "Terrible, Poor, Average,..." so that I can translate them into local language, but I can not find them --> Where can I look for them ?